JP3302620B2 - Noise absorber - Google Patents
Noise absorberInfo
- Publication number
- JP3302620B2 JP3302620B2 JP17902297A JP17902297A JP3302620B2 JP 3302620 B2 JP3302620 B2 JP 3302620B2 JP 17902297 A JP17902297 A JP 17902297A JP 17902297 A JP17902297 A JP 17902297A JP 3302620 B2 JP3302620 B2 JP 3302620B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic member
- magnetic
- insertion hole
- cylindrical
- cable insertion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Coils Or Transformers For Communication (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Noise Elimination (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はケーブルに装着して
用いるノイズ吸収装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise absorbing device mounted on a cable.
【０００２】[0002]
【従来の技術】計測器などの電子機器においては、入出
力用のケーブルを介して侵入するノイズや、外部へ出る
ノイズを、電子機器等の入出力側で吸収して除去するた
めのノイズ吸収装置を設けている（たとえば、実公昭６
２−１４７７０号公報参照）。かかるノイズ吸収装置
は、たとえばフェライトを筒形に成形した磁性部材で構
成されている。2. Description of the Related Art In an electronic device such as a measuring instrument, a noise is absorbed by an input / output side of an electronic device to remove noise that enters through an input / output cable or goes outside. Equipment is provided (for example,
2-147770). Such a noise absorbing device is formed of, for example, a magnetic member formed by molding ferrite into a cylindrical shape.
【０００３】[0003]
【発明が解決しようとする課題】しかし、前記フェライ
トからなる磁性部材では、100MHz〜数百MHz 程度の周波
数のノイズを吸収することができるものの、かかる周波
数よりも高い周波数のノイズは吸収できない。一方、フ
ェライトよりも透磁率の低い磁性ゴムを磁性部材として
用いたノイズ吸収装置では、800MHz〜数GHz 程度の周波
数のノイズを吸収することができるものの、それ以下の
低い周波数のノイズを吸収できない。そこで、２種類の
ノイズ吸収装置を各々ケーブルに装着することもなされ
ているが、ノイズ吸収装置の装着に手間がかかる。However, although the magnetic member made of ferrite can absorb noise at a frequency of about 100 MHz to several hundred MHz, it cannot absorb noise at a frequency higher than such a frequency. On the other hand, a noise absorbing device using magnetic rubber having a lower magnetic permeability than ferrite as a magnetic member can absorb noise at a frequency of about 800 MHz to several GHz, but cannot absorb noise at a frequency lower than that. Therefore, two types of noise absorbing devices are each mounted on a cable, but mounting the noise absorbing device is troublesome.
【０００４】したがって、本発明の目的は、広い周波数
の帯域にわたってノイズを吸収し得ると共に、装着の容
易なノイズ吸収装置を提供することである。Accordingly, it is an object of the present invention to provide a noise absorbing device which can absorb noise over a wide frequency band and can be easily mounted.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に、本出願の第１発明は、筒状の第１磁性部材と、該第
１磁性部材よりも透磁率の低い筒状の第２磁性部材と
を、ケーブル挿通孔の軸方向に重ねると共に、これらの
磁性部材を互いに固定したことを特徴とする。In order to achieve the above object, a first invention of the present application is directed to a first cylindrical magnetic member and a second cylindrical magnetic member having a lower magnetic permeability than the first magnetic member. The magnetic member is overlapped in the axial direction of the cable insertion hole, and the magnetic members are fixed to each other.
【０００６】一方、第２発明は、筒状の第１磁性部材
と、該第１磁性部材よりも透磁率の低い筒状の第２磁性
部材とを、ケーブル挿通孔の径方向に重ねると共に、こ
れらの磁性部材を互いに固定したことを特徴とする。On the other hand, according to a second aspect of the present invention, a cylindrical first magnetic member and a cylindrical second magnetic member having a lower magnetic permeability than the first magnetic member are overlapped in a radial direction of a cable insertion hole. These magnetic members are fixed to each other.
【０００７】これらの発明によれば、互いに透磁率の異
なる筒状の第１および第２磁性部材を設けており、各磁
性部材は、別々の吸収帯域を有しているから、吸収帯域
が拡がる。一方、２つの磁性部材を互いに固定したの
で、１回の装着作業でノイズ吸収装置をケーブルに装着
することができる。According to these inventions, the first and second cylindrical magnetic members having different magnetic permeability are provided, and each magnetic member has a separate absorption band, so that the absorption band is expanded. . On the other hand, since the two magnetic members are fixed to each other, the noise absorbing device can be mounted on the cable in a single mounting operation.
【０００８】本発明において、透磁率の高い第１磁性部
材としては、たとえばフェライトを用いることができ、
一方、透磁率の低い第２磁性部材としては、ゴムにフェ
ライトの粉末を添加したものや合成樹脂に導電性繊維体
を添加したものなどを用いることができる。In the present invention, for example, ferrite can be used as the first magnetic member having high magnetic permeability.
On the other hand, as the second magnetic member having a low magnetic permeability, a material obtained by adding ferrite powder to rubber or a material obtained by adding a conductive fiber to synthetic resin can be used.
【０００９】本発明において「筒状」とは、円筒形の他
に角筒形などの筒形を含み、更に、これらの形状のもの
を径方向に分割した２つ割れのものも含む。なお、「径
方向に分割」とは、軸線を含む面または当該面に平行な
面に、分割面が設定されていることをいう。また、ケー
ブル挿通孔は、円形断面である必要はなく、矩形断面等
であってもよい。In the present invention, "cylindrical" includes cylindrical shapes such as a square cylindrical shape in addition to a cylindrical shape, and further includes those which are split into two in the radial direction. Note that “split in the radial direction” means that a split plane is set on a plane including an axis or a plane parallel to the plane. Further, the cable insertion hole does not need to have a circular cross section, and may have a rectangular cross section or the like.
【００１０】[0010]
【発明の実施の形態】以下、本発明の実施形態および本
発明に含まれない例を図面にしたがって説明する。図１
は本発明に含まれない例を示す。ノイズ吸収装置は、た
とえば２つの第１磁性部材１と、１つの第２磁性部材２
とで構成されている。各磁性部材１，２は、磁性体を筒
状に形成してケーブル３を挿通するためのケーブル挿通
孔４を有している。第１磁性部材１はたとえばフェライ
トで構成されており、一方、第２磁性部材２は、第１磁
性部材１よりも透磁率が低い磁性ゴムなどで構成されて
いる。前記３つの磁性部材１，２，１は、各磁性部材
１，２の間が接着剤で接着されて、ケーブル３の軸線方
向Ｓに積層されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments and the present of the present invention
Examples not included in the invention will be described with reference to the drawings. FIG.
Indicates an example not included in the present invention . Noise absorbing device, for example, the first magnetic member 1 in two, one second magnetic member 2
It is composed of Each of the magnetic members 1 and 2 has a cable insertion hole 4 for inserting a cable 3 by forming a magnetic body into a cylindrical shape. The first magnetic member 1 is made of, for example, ferrite, while the second magnetic member 2 is made of a magnetic rubber or the like having a lower magnetic permeability than the first magnetic member 1. The three magnetic members 1, 2, 1 are laminated in the axial direction S of the cable 3 by bonding the magnetic members 1, 2 with an adhesive.
【００１１】図２（ａ）は、実施形態を示す。図２
（ａ）のノイズ吸収装置は、第２磁性部材２の内径Ｄ２
が第１磁性部材１の内径Ｄ１よりも小さく設定されてい
る。つまり、第２磁性部材２のケーブル挿通孔４は、第
１磁性部材１のケーブル挿通孔４よりも径小である。そ
のため、ケーブル３と第１磁性部材１のケーブル挿通孔
４との間には、隙間ができるから、硬い第１磁性部材１
によってケーブル３が傷付くおそれがない。FIG. 2A shows an embodiment . FIG.
The noise absorbing device of (a) has an inner diameter D2 of the second magnetic member 2.
Is set smaller than the inner diameter D1 of the first magnetic member 1. That is, the cable insertion hole 4 of the second magnetic member 2 is smaller in diameter than the cable insertion hole 4 of the first magnetic member 1. Therefore, since a gap is formed between the cable 3 and the cable insertion hole 4 of the first magnetic member 1, the hard first magnetic member 1
Therefore, there is no possibility that the cable 3 is damaged.
【００１２】図２（ｂ）のノイズ吸収装置は、一対の第
２磁性部材２を設けると共に、該２つの第２磁性部材２
の間に第１磁性部材１を配設している。ここで、ゴムや
樹脂にフェライトの粉末を添加した第２磁性部材２は、
第１磁性部材１に比べて脆くなく、そのため、硬い第１
磁性部材１が両端の軟らかい第２磁性部材２によって保
護されるから、第１磁性部材１が欠けたり割れたりする
おそれがない。The noise absorbing device shown in FIG. 2B has a pair of second magnetic members 2 and the two second magnetic members 2.
The first magnetic member 1 is disposed between them. Here, the second magnetic member 2 obtained by adding ferrite powder to rubber or resin is:
Compared to the first magnetic member 1, the first magnetic member 1 is
Since the magnetic member 1 is protected by the soft second magnetic members 2 at both ends, there is no possibility that the first magnetic member 1 is chipped or broken.
【００１３】なお、磁性部材１，２の数は、３個に限ら
ず、図２（ｃ），（ｄ）のように、２個または３個以上
であってもよい。また、第１磁性部材１および第２磁性
部材２とは異なる透磁率の磁性体からなる第３磁性部材
を設け、吸収帯域を更に広げてもよい。The number of the magnetic members 1 and 2 is not limited to three, but may be two or three or more as shown in FIGS. Further, a third magnetic member made of a magnetic material having a magnetic permeability different from that of the first magnetic member 1 and the second magnetic member 2 may be provided to further expand the absorption band.
【００１４】なお、各磁性部材１，２同士は必ずしも接
着する必要はなく、たとえば、図２（ｅ）に示すよう
に、３つの磁性部材１，２，１を軸線方向Ｓに配設した
状態で、熱収縮樹脂チューブ５によって３つの磁性部材
１，２，１を囲撓して一体に固定してもよい。The magnetic members 1 and 2 do not necessarily need to be bonded to each other. For example, as shown in FIG. 2 (e), a state in which three magnetic members 1, 2 and 1 are disposed in the axial direction S. Then, the three magnetic members 1, 2, 1 may be surrounded by the heat-shrinkable resin tube 5 and fixed integrally.
【００１５】図３の例においては、各磁性部材１，２が
ケーブル挿通孔４の径方向に２つに分割されていると共
に、半割れの分割体１ａ，２ａが、それぞれ、収容ケー
ス６に収容されている。該収容ケース６は、樹脂製で、
径方向に分割された一対の分割ケース６ａ，６ｂが樹脂
ヒンジ６ｃで連結されていると共に、ケース閉止用の係
合部６ｄ，６ｅを備えている。前記各磁性部材１，２
は、図３（ｂ）に示す突起部１０が、収容ケース６の係
合凹所６０に係合して、収容ケース６に固定されている
ことで、各磁性部材１，２同士が互いに固定されてい
る。なお、図３（ｃ）のように、収容ケース６は、筒状
に閉じた後、樹脂バンド７によって締め付けられ、図３
（ａ）の各分割体１ａ，２ａの分割面が圧接するように
なっている。In the example shown in FIG . 3, each of the magnetic members 1 and 2 is divided into two in the radial direction of the cable insertion hole 4, and the half-split divided bodies 1a and 2a Is housed. The storage case 6 is made of resin,
A pair of radially divided cases 6a, 6b are connected by a resin hinge 6c, and are provided with engaging portions 6d, 6e for closing the cases. Each of the magnetic members 1 and 2
The magnetic members 1 and 2 are fixed to each other by the protrusions 10 shown in FIG. 3B being fixed to the housing case 6 by engaging with the engagement recesses 60 of the housing case 6. Have been. As shown in FIG. 3C, the housing case 6 is closed by a resin band 7 after being closed in a cylindrical shape.
The divided surfaces of the divided bodies 1a and 2a shown in FIG.
【００１６】ここで、フェライトまたは磁性ゴムからな
る１つの磁性部材のみを分割ケース６ａ，６ｂに収容し
たものでは、フェライトまたは磁性ゴムごとに分割ケー
ス６ａ，６ｂが必要になる。つまり、複数個の収容ケー
ス６が必要になる。したがって、コストアップの原因と
なる。これに対し、本ノイズ吸収装置では、収容ケース
６が１つでよいから、コストダウンを図ることもでき
る。Here, in the case where only one magnetic member made of ferrite or magnetic rubber is housed in the split cases 6a and 6b, the split cases 6a and 6b are required for each ferrite or magnetic rubber. That is, a plurality of storage cases 6 are required. Therefore, it causes an increase in cost. On the other hand, in the present noise absorbing device, since only one housing case 6 is required, the cost can be reduced.
【００１７】なお、各磁性部材１，２は、収容ケース６
に収容されていることで互いに固定されるので、各磁性
部材１，２同士を必ずしも接着する必要はない。なお、
各磁性部材１，２の分割体１ａ，２ａは、該分割体１
ａ，２ａに係合凹部を形成し、一方、各分割ケース６
ａ，６ｂに係合突起を形成して、各分割ケースから脱落
しないように分割ケース６ａ，６ｂに固定してもよい。 Each of the magnetic members 1 and 2 is
The magnetic members 1 and 2 are not necessarily bonded to each other because they are fixed to each other by being accommodated in the magnetic member. In addition,
The divided bodies 1a and 2a of the magnetic members 1 and 2 are
a, 2a are formed with engaging recesses, while each of the divided cases 6
The engaging projections may be formed on the split cases 6a and 6b so as not to fall off from the split cases.
【００１８】以上の例は、第１磁性部材１と第２磁性部
材２とをケーブル挿通孔４の軸方向に重ねたが、図４〜
図６の実施形態では、第１磁性部材１と第２磁性部材２
とをケーブル挿通孔４の径方向に重ねると共に、これら
の磁性部材１，２を互いに固定している。In the above example , the first magnetic member 1 and the second magnetic member 2 are overlapped in the axial direction of the cable insertion hole 4, but FIGS.
In the embodiment of FIG. 6, the first magnetic member 1 and the second magnetic member 2
Are overlapped in the radial direction of the cable insertion hole 4 and the magnetic members 1 and 2 are fixed to each other.
【００１９】図４（ａ），（ｂ）に示すように、第２磁
性部材２は第１磁性部材１に一体に成形されて固着され
ていると共に第１磁性部材１の内周側に配設されてい
る。また、第２磁性部材２のケーブル挿通孔４は、図４
（ｂ）に示すように、テーパー状に形成されて、径小部
４ａを有しており、矢印Ａ方向から挿通したケーブルが
抜けにくい構造となっており、ケーブルに対するノイズ
吸収装置の位置がズレにくいので、ノイズの吸収特性が
変動しにくいという利点を持つ。また、本実施形態で
は、素材が柔らかな第２磁性部材２を第１磁性部材１の
内周側に設けたので、ノイズ吸収装置に挿通したケーブ
ルが傷付きにくいという利点もある。As shown in FIGS. 4A and 4B, the second magnetic member 2 is integrally formed and fixed to the first magnetic member 1 and is disposed on the inner peripheral side of the first magnetic member 1. Has been established. The cable insertion hole 4 of the second magnetic member 2 is
As shown in (b), the tapered shape has a small-diameter portion 4a, so that the cable inserted from the direction of arrow A is difficult to be pulled out, and the position of the noise absorbing device with respect to the cable is shifted. This is advantageous because it is difficult to change the noise absorption characteristics. Further, in the present embodiment, since the second magnetic member 2 made of a soft material is provided on the inner peripheral side of the first magnetic member 1, there is an advantage that the cable inserted into the noise absorbing device is hardly damaged.
【００２０】なお、ケーブル挿通孔４の形状は、図４
（ｃ），（ｄ）のような形状であってもよい。The shape of the cable insertion hole 4 is shown in FIG.
Shapes such as (c) and (d) may be used.
【００２１】図５は変形例を示す。図５（ａ）のノイズ
吸収装置は、第２磁性部材２を第１磁性部材１の外周側
に配設したものである。この場合、ゴムにフェライト粉
末を添加した磁性ゴムなどで第２磁性部材２を構成する
ことにより、脆い第１磁性部材１に衝撃力が付加される
のを防止でき、第１磁性部材１を保護して第１磁性部材
１の割れや欠けを防止することができる。[0021] FIG. 5 shows a change Katachirei. In the noise absorbing device of FIG. 5A, the second magnetic member 2 is provided on the outer peripheral side of the first magnetic member 1. In this case, by configuring the second magnetic member 2 with a magnetic rubber or the like obtained by adding ferrite powder to rubber, it is possible to prevent an impact force from being applied to the fragile first magnetic member 1 and protect the first magnetic member 1 Thus, cracking and chipping of the first magnetic member 1 can be prevented.
【００２２】なお、図５（ｂ）のように、第１磁性部材
１の外周面だけでなく第１磁性部材１の端面１ｂも第２
磁性部材２で被うようにしてもよい。As shown in FIG. 5 (b), not only the outer peripheral surface of the first magnetic member 1 but also the end surface 1b of the first magnetic member 1 has the second surface.
It may be covered with the magnetic member 2.
【００２３】図５（ｃ）のノイズ吸収装置は、第１磁性
部材１の内周面、外周面および端面１ｂを第２磁性部材
２で被ったものである。本ノイズ吸収装置によれば、第
１磁性部材１およびケーブル３の双方を保護することが
できる。The noise absorbing device shown in FIG. 5C is obtained by covering the inner peripheral surface, the outer peripheral surface, and the end surface 1b of the first magnetic member 1 with the second magnetic member 2. According to the present noise absorbing device, both the first magnetic member 1 and the cable 3 can be protected.
【００２４】なお、前記図４および図５（ａ）〜（ｃ）
の実施形態においても、ノイズ吸収装置を図５（ｄ）の
ように分割型とし、収容ケース６内に第１磁性部材１お
よび第２磁性部材２を収容してもよい。4 and 5 (a) to 5 (c).
Also in the embodiment, the noise absorbing device may be a split type as shown in FIG. 5D, and the first magnetic member 1 and the second magnetic member 2 may be housed in the housing case 6.
【００２５】図６は実施形態を示す。この実施形態で
は、第１磁性部材１がケーブル挿通孔４の径方向に２つ
に分割されている。一方、第２磁性部材２は第１磁性部
材１を収容する収容ケース６を構成している。すなわ
ち、該収容ケース６は、磁性体を添加したゴムまたは樹
脂からなり、一対の分割ケース６ａ，６ｂが樹脂ヒンジ
６ｃで連結されていると共に、ケース閉止用の係合部６
ｄ，６ｅを備えている。[0025] FIG. 6 shows the implementation form. The implementation form of this, the first magnetic member 1 is divided into two in the radial direction of the cable insertion hole 4. On the other hand, the second magnetic member 2 constitutes a housing case 6 for housing the first magnetic member 1. That is, the housing case 6 is made of rubber or resin to which a magnetic material is added, and the pair of divided cases 6a and 6b are connected by the resin hinge 6c, and the case closing engagement portion 6 is used.
d, 6e.
【００２６】図６（ｂ）に示すように、前記第１磁性部
材１の突起部１０と、第２磁性部材２の係合凹所２０
は、互いに係合しており、第１磁性部材１と第２磁性部
材２とが互いに固定されて、第１磁性部材１が第２磁性
部材２から脱落しないようになっている。なお、図６
（ｃ）に示すように、収容ケース６は筒状に閉じた後、
樹脂バンド７によって締め付けられる。なお、図６
（ｃ）の状態においては、第１磁性部材１と第２磁性部
材２とが固定されるので、前記図６（ａ）の突起部１０
や係合凹所２０は必ずしも必要ではない。As shown in FIG. 6B, the protrusion 10 of the first magnetic member 1 and the engagement recess 20 of the second magnetic member 2 are provided.
Are engaged with each other so that the first magnetic member 1 and the second magnetic member 2 are fixed to each other so that the first magnetic member 1 does not drop off from the second magnetic member 2. FIG.
As shown in (c), after the storage case 6 is closed in a cylindrical shape,
Fastened by the resin band 7. FIG.
In the state shown in FIG. 6C, the first magnetic member 1 and the second magnetic member 2 are fixed, so that the protrusion 10 shown in FIG.
The engagement recess 20 is not always necessary.
【００２７】本実施形態によれば、従来の分割ケース付
のノイズ吸収装置のケースの素材に磁性体を添加するだ
けで、ノイズの吸収帯域を広げることができる。According to this embodiment, the noise absorption band can be widened only by adding a magnetic material to the material of the case of the conventional noise absorbing device with a split case.
【００２８】なお、前記各実施形態では、ケーブル挿通
孔にケーブルを１本だけ通したが、ケーブル挿通孔にケ
ーブルを複数本通してもよいし、ケーブルを巻回して複
数回通してもよい。In the above embodiments, only one cable is passed through the cable insertion hole. However, a plurality of cables may be passed through the cable insertion hole, or the cable may be wound and passed a plurality of times.
【００２９】[0029]
【発明の効果】以上説明したように、本発明によれば、
互いに透磁率の異なる筒状の第１および第２磁性部材を
設けており、各磁性部材は別々の吸収帯域を有している
から、ノイズの吸収帯域が広がる。一方、２つの磁性部
材を互いに固定したので、１回の装着作業でノイズ吸収
装置をケーブルに装着することができる。As described above, according to the present invention,
The first and second cylindrical magnetic members having different magnetic permeability from each other are provided, and each magnetic member has a separate absorption band, so that the noise absorption band is widened. On the other hand, since the two magnetic members are fixed to each other, the noise absorbing device can be mounted on the cable in a single mounting operation.
【００３０】また、軸方向に磁性部材を重ねた第１発明
においては、第２磁性部材のケーブル挿通孔を第１磁性
部材のケーブル挿通孔よりも径小にすれば、硬い材質の
第１磁性部材のケーブル挿通孔でケーブルの外表面が傷
付きにくくなる。In the first invention in which the magnetic members are overlapped in the axial direction, if the cable insertion hole of the second magnetic member is made smaller in diameter than the cable insertion hole of the first magnetic member, the first magnetic member made of a hard material can be used. The outer surface of the cable is less likely to be damaged by the cable insertion hole of the member.
【００３１】また、２つの第２磁性部材の間に第１磁性
部材を設ければ、軟らかい材質の第２磁性部材によっ
て、脆い材質の第１磁性部材を衝撃力から保護すること
ができる。If the first magnetic member is provided between the two second magnetic members, the first magnetic member made of a brittle material can be protected from impact by the second magnetic member made of a soft material.
【００３２】また、分割型のタイプでは、複数種類の磁
性部材を１つの収容ケースで収容できるから、製造コス
トも安価になる。In the case of the split type, since a plurality of types of magnetic members can be accommodated in one accommodation case, the manufacturing cost is reduced.
【００３３】一方、ケーブル挿通孔の径方向に磁性部材
を重ねた第２発明においては、軟質の第２磁性部材を硬
質の第１磁性部材の内周側に配設すれば、ケーブル挿通
孔が軟質の第２磁性部材で形成されるから、ケーブルが
傷付くおそれもない。特に、ケーブル挿通孔をテーパー
状にして、径小部を設ければ、該径小部によって、ケー
ブルに対してノイズ吸収装置を固定できるから、ノイズ
の吸収特性が変動しにくいという利点がある一方で、ケ
ーブルが傷付くのを防止できる。On the other hand, in the second invention in which the magnetic members are overlapped in the radial direction of the cable insertion hole, if the soft second magnetic member is disposed on the inner peripheral side of the hard first magnetic member, the cable insertion hole can be formed. Since the cable is formed of the soft second magnetic member, there is no possibility that the cable is damaged. In particular, if the cable insertion hole is tapered and a small diameter portion is provided, the noise absorption device can be fixed to the cable by the small diameter portion. Thus, the cable can be prevented from being damaged.
【００３４】逆に、軟質の第２磁性部材を脆い第１磁性
部材の外周側に配設すれば、脆い第１磁性部材を第２磁
性部材によって保護できるから、第１磁性部材が欠けた
り、割れたりするおそれがない。Conversely, if the soft second magnetic member is disposed on the outer peripheral side of the fragile first magnetic member, the fragile first magnetic member can be protected by the second magnetic member. There is no risk of cracking.
【００３５】また、軟らかい第２磁性部材によって第１
磁性部材の内周面および外周面の双方を被えば、第１磁
性部材およびケーブルの双方を保護することができる。Further, the first magnetic member is used for the first magnetic member.
If both the inner and outer peripheral surfaces of the magnetic member are covered, both the first magnetic member and the cable can be protected.
【００３６】また、分割型のタイプでは、第２磁性部材
によって第１磁性部材の収容ケースを形成すれば、収容
ケースの素材を変えるだけで、ノイズの吸収帯域を広げ
ることができる。In the case of the split type, if the housing case for the first magnetic member is formed by the second magnetic member, the noise absorption band can be expanded only by changing the material of the housing case.
【図１】本発明に含まれない例を示すノイズ吸収装置の
断面図および斜視図である。FIG. 1 is a sectional view and a perspective view of a noise absorbing device showing an example not included in the present invention.
【図２】（ａ）は本発明の実施形態を示すノイズ吸収装
置の断面図、（ｂ）〜（ｅ）は他の例を示す断面図であ
る。FIG. 2A is a cross-sectional view of a noise absorbing device showing an embodiment of the present invention, and FIGS. 2B to 2E are cross-sectional views showing another example .
【図３】径方向に分割したノイズ吸収装置の斜視図およ
び断面図である。FIG. 3 is a perspective view and a sectional view of a noise absorbing device divided in a radial direction .
【図４】本発明の実施形態を示すノイズ吸収装置の斜視
図および断面図である。FIG. 4 is a perspective view and a cross-sectional view of a noise absorbing device showing an embodiment of the present invention .
【図５】本発明の実施形態の変形例を示すノイズ吸収装
置の断面図である。FIG. 5 is a cross-sectional view of a noise absorbing device showing a modification of the embodiment of the present invention .
【図６】本発明の実施形態を示すノイズ吸収装置の斜視
図および横断面図である。FIG. 6 is a perspective view and a cross-sectional view of a noise absorbing device showing an embodiment of the present invention .
１：第１磁性部材 ２：第２磁性部材 ４：ケーブル挿通孔 ６：収容ケース ６ａ，６ｂ：分割ケース 1: First magnetic member 2: Second magnetic member 4: Cable insertion hole 6: Housing case 6a, 6b: Split case
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−29152（ＪＰ，Ａ) 特開 平７−58482（ＪＰ，Ａ) 特開 平５−121244（ＪＰ，Ａ) 実開 昭61−55327（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01F 17/06 H04B 15/00 H05K 9/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-29152 (JP, A) JP-A-7-58482 (JP, A) JP-A-5-121244 (JP, A) 55327 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H01F 17/06 H04B 15/00 H05K 9/00
Claims (8)
を設けた筒状の磁性部材を備えたノイズ吸収装置におい
て、 筒状の硬い第１磁性部材と、該第１磁性部材よりも透磁
率の低い筒状の軟らかい第２磁性部材とを、ケーブル挿
通孔の軸方向に重ねると共に、これらの磁性部材を互い
に固定し、 前記第２磁性部材のケーブル挿通孔を、前記第１磁性部
材のケーブル挿通孔よりも径小とし たことを特徴とする
ノイズ吸収装置。1. A noise absorbing device comprising a cylindrical magnetic member having a cable insertion hole formed by forming a magnetic body into a cylindrical shape, wherein the first magnetic member has a hard cylindrical shape and a first magnetic member. A cylindrical soft second magnetic member having a low magnetic permeability is overlapped in the axial direction of the cable insertion hole, these magnetic members are fixed to each other , and the cable insertion hole of the second magnetic member is connected to the first magnetic portion.
A noise absorber characterized in that the diameter is smaller than the cable insertion hole of the material .
らの分割された磁性部材が一対の半割れの分割ケース内
に収容されているノイズ吸収装置。2. The noise absorbing device according to claim 1, wherein each of the magnetic members is divided in a radial direction, and the divided magnetic members are accommodated in a pair of half-split split cases.
を設けた筒状の磁性部材を備えたノイズ吸収装置におい
て、 筒状の硬質の第１磁性部材と、該第１磁性部材よりも透
磁率の低い筒状の軟らかい材質の第２磁性部材とを、ケ
ーブル挿通孔の径方向に重ねると共に、これらの磁性部
材を互いに固定し、前記軟らかい材質の第２磁性部材を脆い第１磁性部材の
内周側に配設した ノイズ吸収装置。3. A noise absorbing device comprising a cylindrical magnetic member having a magnetic material formed in a cylindrical shape and having a cable insertion hole, wherein the first magnetic member comprises: a cylindrical hard first magnetic member; and a second magnetic member of a low cylindrical soft material having magnetic permeability, with overlap in the radial direction of the cable insertion hole, fixed these magnetic members together, the first magnetic fragile the second magnetic member of the soft material Material
Noise absorber installed on the inner circumference .
ーパー状に形成して、ケーブルが抜けにくいようにする
ための 径小部を設けたノイズ吸収装置。 4. The cable insertion hole according to claim 3, wherein a cable insertion hole of the second magnetic member made of a soft material is used.
Formed into a paper shape to prevent the cable from coming off
Noise absorber with a small diameter section for
を設けた筒状の磁性部材を備えたノイズ吸収装置におい
て、 筒状の脆い第１磁性部材と、該第１磁性部材よりも透磁
率の低い筒状の軟らかい材質の第２磁性部材とを、ケー
ブル挿通孔の径方向に重ねると共に、これらの磁性部材
を互いに固定し、前記軟らかい材質の第２磁性部材を脆い第１磁性部材の
外周側に配設した ノイズ吸収装置。5. A noise absorbing device comprising a cylindrical magnetic member formed of a magnetic material in a cylindrical shape and provided with a cable insertion hole, wherein the first magnetic member is formed of a fragile cylindrical magnetic member. and a second magnetic member of a low cylindrical with soft material permeability, with overlap in the radial direction of the cable insertion hole, fixed these magnetic members together, the first magnetic member fragile the second magnetic member of the soft material of
A noise absorbing device arranged on the outer peripheral side .
を設けた筒状の磁性部材を備えたノイズ吸収装置におい
て、 筒状の脆い第１磁性部材と、該第１磁性部材よりも透磁
率の低い筒状の軟らかい材質の第２磁性部材とを、ケー
ブル挿通孔の径方向に重ねると共に、これらの磁性部材
を互いに固定し、前記軟らかい材質の第２磁性部材によって前記脆い第１
磁性部材の内周面および外周面が覆われている ノイズ吸
収装置。6. A noise absorbing device comprising a cylindrical magnetic member having a magnetic body formed in a cylindrical shape and provided with a cable insertion hole, wherein the first magnetic member has a cylindrical brittle first magnetic member. A cylindrical soft second material having a low magnetic permeability is overlapped in the radial direction of the cable insertion hole, and these magnetic members are fixed to each other .
A noise absorbing device in which an inner peripheral surface and an outer peripheral surface of a magnetic member are covered .
れていると共に、前記第２磁性部材が第１磁性部材を収
容するケースを構成しているノイズ吸収装置。7. The case according to claim 3 , wherein the first and second magnetic members are each radially divided, and the second magnetic member accommodates the first magnetic member. The noise absorbing device that makes up.
て、hand, 前記第１磁性部材がフェライトで構成され、The first magnetic member is made of ferrite; 一方、前記第２磁性部材が合成樹脂に導電性繊維体を添On the other hand, the second magnetic member adds a conductive fiber to the synthetic resin.
加したもの、あるいは、ゴムまたは樹脂にフェライトのFerrite on rubber or resin.
粉末を添加したものからなる、ノイズ吸収装置。A noise absorbing device made of powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17902297A JP3302620B2 (en) | 1997-06-18 | 1997-06-18 | Noise absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17902297A JP3302620B2 (en) | 1997-06-18 | 1997-06-18 | Noise absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH118123A JPH118123A (en) | 1999-01-12 |
| JP3302620B2 true JP3302620B2 (en) | 2002-07-15 |
Family
ID=16058753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17902297A Expired - Fee Related JP3302620B2 (en) | 1997-06-18 | 1997-06-18 | Noise absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3302620B2 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4412702B2 (en) | 2003-03-28 | 2010-02-10 | スミダコーポレーション株式会社 | Inductance element |
| US7023313B2 (en) | 2003-07-16 | 2006-04-04 | Marvell World Trade Ltd. | Power inductor with reduced DC current saturation |
| US7307502B2 (en) | 2003-07-16 | 2007-12-11 | Marvell World Trade Ltd. | Power inductor with reduced DC current saturation |
| US7489219B2 (en) | 2003-07-16 | 2009-02-10 | Marvell World Trade Ltd. | Power inductor with reduced DC current saturation |
| US7872454B2 (en) | 2003-08-21 | 2011-01-18 | Marvell World Trade Ltd. | Digital low dropout regulator |
| US7760525B2 (en) | 2003-08-21 | 2010-07-20 | Marvell World Trade Ltd. | Voltage regulator |
| JP2006005236A (en) * | 2004-06-18 | 2006-01-05 | Murata Mfg Co Ltd | Component for noise countermeasure and its mounting structure |
| JP2008226915A (en) * | 2007-03-08 | 2008-09-25 | Tdk Corp | Magnetic part |
| WO2011136232A1 (en) * | 2010-04-26 | 2011-11-03 | Terakawa Takashige | Noise damper |
| JP2013258335A (en) * | 2012-06-13 | 2013-12-26 | Seiwa Electric Mfg Co Ltd | Ferrite core |
| JP2014096538A (en) * | 2012-11-12 | 2014-05-22 | Kitagawa Ind Co Ltd | Composite ferrite core and noise current absorption tool |
| JP6379401B2 (en) * | 2014-09-11 | 2018-08-29 | 北川工業株式会社 | Output noise reduction device |
| KR101876800B1 (en) * | 2018-04-02 | 2018-07-10 | 정기범 | Apparatus for removing motor noise |
| JP6860716B1 (en) * | 2020-02-05 | 2021-04-21 | 株式会社リケン | Circular magnetic material for noise suppression |
-
1997
- 1997-06-18 JP JP17902297A patent/JP3302620B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH118123A (en) | 1999-01-12 |
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